The head loss in pipe flow when fluid goes through bend flow channel is one of the main factors leading to serial mechanism fire-monitors’ pressure drop and short-distance jet. The design of a fire-monitor with 2 degrees of freedom compound mechanism, which realizes the substitution of the traditional bend flow channel (BFC) with a straight one(SFC) based on the analysis of fluid dynamics theory, is presented in this paper. The expected results of the work were achieved based on the experimental results, which has guidance for the redevelopment of novel fire-monitor with longer distance, higher efficiency and lower energy consumption than traditional one.